臺灣博碩士論文加值系統

非方向性矽鋼片是製作馬達鐵芯重要材料，在製成鐵芯前常以沖壓為成形的方法，減少加工過程中產生的劣化為研究目的。本論文研究各種沖壓參數包含成形條件、間隙、沖壓速度與壓料力對非方向性矽鋼片之影響，沖壓後以鐵損值、硬度、金相與殘留應力為特性指標，並以田口方法與迴歸分析對各種沖壓參數在特性指標上的影響進行分析。實驗結果顯示，成形條件與間隙在各方面都有一定的影響力，沖壓速度與壓料力則不明顯，原因在於本實驗參數設計有相當自由度未發揮，並且有潛在的干擾因子，未來期望能加入更多因子的更大的水準變化量投入實驗以期達到非方性矽鋼片低劣化的製程技術。

Non-oriented electrical steel is a major material of motor core. Stamping is manufactured to make electrical steel sheet into core. The purpose of this research was to study the degradation of magnetic properties after stamping. The effect of stamping parameters, including forming conditions, clearance, pin speed and blank holder pressure, on magnetic properties, microhardness, microstructure and residual stress of non-oriented electrical steel after stamping was investigated. Moreover, regression analysis and Taguchi method were used to quantitatively analyze the predominant factors of four different parameters. Based on the analytical results, forming conditions and clearance had the predominant influence in all respects. On the other hand, the effects of pin speed and blank holder pressure were not conspicuous. Both the DOF of the orthogonal arrays were not saturated and there were some interference factors not estimated. In the future, it should redesign the orthogonal arrays and consider more parameters to achieve the goal which clarify the degradation mechanism of non-oriented electrical steel after stamping.

摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章 緒 論 1
1.1研究動機 1
1.2計畫目標 1
1.3沖壓基礎 2
1.3.1冷作沖壓的特點 2
1.3.2冷作沖壓的發展方向 3
1.3.3沖壓中的剪切模式 5
1.3.4沖切加工力估算 5
1.3.5沖切脫料力 6
1.3.6總沖切加工力 6
1.3.7沖切側向力 6
1.4文獻回顧 7
第二章 實驗方法與原理 29
2.1 沖壓參數設定 29
2.1.1成形條件 29
2.1.2間隙 29
2.1.3沖壓速度 30
1.4.4壓料力 30
2.2鐵損量測 30
2.2.1鐵損 30
2.2.2殘留應變和應力對鐵損值影響 32
2.2.3鐵損值量測 32
2.3硬度量測 33
2.3.1硬度定義 33
2.3.2維克氏硬度試驗 33
2.3.3硬度量測 34
2.4 金相量測 34
2.5 X光殘留應力分析 35
2.5.1 X光繞射原理 35
2.5.2 殘留應力檢測 35
2.5.3 X光儀器及試片製作 36
2.6資料統計與分析 37
2.6.1 田口方法 37
2.6.2 變異分析 37
2.6.3 迴歸分析 38
第三章 結果與討論 50
3.1對鐵損影響 50
3.2對硬度影響 67
3.3 對沖切面破斷長度影響 88
3.4 對殘留應力影響 109
第四章 結論 122
4.1 各項參數造成的作用 123
4.3 依不同量測結果探討 124
第五章 未來發展與建議 125
參考文獻 126

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